#include <iostream> using namespace std; int main() { int a, b; char op; cin >> a >> b >> op; if (op == '+') { cout << a + b << endl; } else if (op == '-') { cout << a - b << endl; } else if (op == '*') { cout << a * b << endl; } else if (op == '/') { if (b == 0) { cout << "Divided by zero!" << endl; } else { cout << a / b << endl; } } else { // 不是 + - * / 中的任何一个 cout << "Invalid operator!" << endl; } return 0; }